This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1882 Excerpt: ...William Thomson. The variation of tidal level at a given port is approximately the resultant of two simple harmonic variations, their periods being respectively half a lunar day and half a solar day, and the amplitude of the former being in general rather more than double that of the latter. When the phases of the two ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1882 Excerpt: ...William Thomson. The variation of tidal level at a given port is approximately the resultant of two simple harmonic variations, their periods being respectively half a lunar day and half a solar day, and the amplitude of the former being in general rather more than double that of the latter. When the phases of the two concur we have spring tides, and when they are in opposition we have neap tides. To obtain a closer approximation, the variation of tidal level must be regarded as the resultant of a much larger number of simple harmonic components, the periods of which are known from astronomical considerations, and are the same for all ports, while the amplitudes and the epochs of maximum for the separate components will be very different for different ports. These epochs and amplitudes for a given port can be calculated from a year's continuous record of tidal level at that port (better from several years' record), and when they have been thus ascertained, the tidal level at any future moment can be predicted from them. The tide-predicting machine is intended for making such prediction in the form of a continuous curve, whose ordinates are the heights of the tide. The principle of its working is illustrated by Fig. 40. A number of pulleys, one for each simple harmonic component, are carried by cranks which are made to revolve by clockwork, the length of each crank being proportional to the amplitude of the corresponding component. The axles are ranged in two rows, an upper and a lower, and a flexible wire passes alternately below a lower and above an upper pulley. The distances of the Fig. 40. upper from the lower pulleys are very great compared with the lengths of the cranks, and the portions of wire which run from each pulley to the next are always nearly...
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Add this copy of Vibratory Motion and Sound to cart. $56.29, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2016 by Palala Press.
Add this copy of Vibratory Motion and Sound to cart. $120.39, good condition, Sold by Phatpocket Limited rated 4.0 out of 5 stars, ships from Waltham Abbey, ESSEX, UNITED KINGDOM.
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